[tpm2] Re: tpm2_createprimary to a transient handle...
Kenneth Goldman <kgoldman at us.ibm.com>
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Thanks for pointing that out. I'll see if I can get the spec fixed.
There's nothing to stop you from creating a signing primary key in the endorsement hierarchy. However, 'the EK', the one that has a certificate from the TPM vendor, is not a signing key.
From: Sievert, James <james.sievert(a)bsci.com>
Sent: Friday, March 4, 2022 8:51 AM
To: tpm2(a)lists.01.org
Subject: [EXTERNAL] [tpm2] Re: tpm2_createprimary to a transient handle...
? However, the EK is not a signing key. It cannot sign anything.
Section 2.1.2.2 of TCG Credential Profile EK 2.0 (trustedcomputinggroup.org)<https://trustedcomputinggroup.org/wp-content/uploads/TCG_IWG_EKCredentialProfile_v2p4_r3.pdf> contradicts your statement:
"For such platforms, privacy is not a central concern and unique identification is of critical importance. These platforms MAY use a certified EK for signing operations."
From: Kenneth Goldman <kgoldman(a)us.ibm.com<mailto:kgoldman(a)us.ibm.com>>
Sent: Friday, March 4, 2022 8:31 AM
To: Sievert, James <james.sievert(a)bsci.com<mailto:james.sievert(a)bsci.com>>; tpm2(a)lists.01.org<mailto:tpm2(a)lists.01.org>
Subject: {External} RE: tpm2_createprimary to a transient handle...
In general (not the command line tools), the create primary result stays loaded.
However, the EK is not a signing key. It cannot sign anything.
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<p class="MsoNormal" style="margin-left:.5in"><b>Thanks for pointing that out. I'll see if I can get the spec fixed.<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b><o:p> </o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>There's nothing to stop you from creating a signing primary key in the endorsement hierarchy. However, 'the EK', the one that has a certificate from the TPM vendor, is not a signing key.<o:p></o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b><o:p> </o:p></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b>From:</b> Sievert, James <[email protected]>
<br>
<b>Sent:</b> Friday, March 4, 2022 8:51 AM<br>
<b>To:</b> [email protected]<br>
<b>Subject:</b> [EXTERNAL] [tpm2] Re: tpm2_createprimary to a transient handle...<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
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</span></span></span><![endif]><span style="font-family:"DejaVu Sans",sans-serif">However, the EK is not a signing key. It cannot sign anything.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">Section 2.1.2.2 of <a href="https://trustedcomputinggroup.org/wp-content/uploads/TCG_IWG_EKCredentialProfile_v2p4_r3.pdf">TCG Credential Profile EK 2.0 (trustedcomputinggroup.org)</a> contradicts your statement:<br>
<br>
“For such platforms, privacy is not a central concern and unique identification is of critical importance. These platforms MAY use a certified EK for signing operations.”<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><b>From:</b> Kenneth Goldman <<a href="mailto:[email protected]">[email protected]</a>>
<br>
<b>Sent:</b> Friday, March 4, 2022 8:31 AM<br>
<b>To:</b> Sievert, James <<a href="mailto:[email protected]">[email protected]</a>>;
<a href="mailto:[email protected]">[email protected]</a><br>
<b>Subject:</b> {External} RE: tpm2_createprimary to a transient handle...<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"DejaVu Sans",sans-serif">In general (not the command line tools), the create primary result stays loaded.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"DejaVu Sans",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"DejaVu Sans",sans-serif">However, the EK is not a signing key. It cannot sign anything.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"DejaVu Sans",sans-serif"><o:p> </o:p></span></p>
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